Cushion tool-holder for pneumatic hammers.



PATENTED OCT. 24, 1905.

S. W. GOODHUE.

CUSHION TOOL HOLDER FOR PNEUMATIC HAMMERS.

APPLIGATION FILED OUT. 3, 1904.

Stephen W. Goodhue muazw. B GRAHAM c0, mlovu-Llmoammins. WASHINGTOM u c.

. "barren srarns PATENT oFFIoE.

STEPHEN W. (JrOODI-IUE, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE- HALFTO OPAL SEDGWICK, OF )ASEY, ILLINOIS.

CUSMIIUN TOOL-HOLDER FOR.PNEUIVIATIC HAMMERS.

Specification of Letters Patent.

Patented Oct. 24, 1905.

Application filed October 3, 1904. Serial No. 227,028.

To (1H 10/1/0711, it *nuty coltccl'n:

Be it known that I, STEPHEN W. GOODHUIQ, a citizen of the United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented certain new and useful Improvements in Cushion Tool-Holders for Pneumatic Hammers, of which the following is a specification.

At the present time the tools used by stonecutters are 01 considerablelength in order to afi'ord a handheld on the tool proper, this being thecase whether said tools are used in connection with a hand-hammer or inthe modern manner in connection with an airhammer. In the use of such atool conside1- ably over two-thirds of the tool is waste for the reasonthat after about one-third of the tool has been worn away from thecutting end the remainder is too short to be used and must either beworked over into smaller tools or thrown away. Thesteel necessarily usedin tools of this kind because 01 the waste must be of the old-i ashionedkind which requires tempering, and consequently a very material portionof the time required on any job is consumed in the sharpening of tools.

The object of my invention is to provide a tool-holder especiallyadapted for use in connection with pneumatic hammers, but notnecessarily limited to such use, capable of receiving small pieces ofsteel of the required cross-section, the arrangement being such that themore expensive self-tempering or highspeed steel may be used and alsosuch that these short pieces of steel may be continuously projected fromthe tool, so that the waste shall be very small.

In the use of pneumatic hammers it is found that the hand and arm of theoperator in which the cutting-tool itself is held becomes numbed after ashort time because of the continuous vibration imparted by the pneumatichammer; and the further object of my invention is to provide thetool-holder already described with a peculiar spring-handle by means ofwhich the holding-hand will not receive the vibrations of the hammer.

The accompanying drawings illustrate my invention.

Figure 1 is a central vertical sectional view of a tool holder andhandle embodying my invention; Fig. 2, an elevation of the tool shown inFig. 1 at right angles to said figure. Fig.

3 is a vertical sectional detail of the holder with a slightly differentform of tool therein; Fig. 4, a plan of the tool shown in Fig. 3, andFig. 5 a plan of a modified form of holder for receiving a series ofcutters arranged to form a surfacing-tool.

In the drawings. 10 indicates the main body or shank of the holder,provided at its upper end with an ensmalled portion 11, adapted to fitinto a pneumatic hammer and receive the blows therefrom. The lower endof shank 10 is provided with a socket 152, into which fits the stem 13of the holder proper. This stem is split axially by a slot 14: to form apair of jaws or fingers 14 1 1, which jaws are tapered or conical upontheir exteriors and threaded on said conical portion at 14'. Above theconical portion of the jaws the shank 13 is threaded, as at 13', to apoint considerably below the upper or inner end of the slot 14, andmounted upon these threads is an adjusting collar or abutment 1 1.Threaded upon the conical threads 1 1 is a clamping-shell 16, which isprovided with a tapered threaded portion 16, mating with the threads 14,the arrangement being such that by turning the shell in one directionupon the threads 14" the jaws 14: will be clamped together, and thusserve to hold in the slot between the jaws the cutting-chisel 17, saidchisel being pref erably'made of high-grade steel and of such lengththat its inner end abuts against the abutment 15. The tool 17 may assumeseveral forms--as, for instance, as shown in Fig. 3, instead of beingmade in a single piece, I show the tool as formed of a plurality oflengths 17, each of which is provided at its cutting end with apyramidal head. In this form I have shown iour chisels 17, arrangedbetween the jaws 14. In such construction it is necessary to place inslot 14 at the inner end of the chisel 17 a cross-piece 18, whichcross-piece itself lies between the inner ends of the chisels and theabutment 15.

It will be readily understood that the form of jaws 14 may be varied tosuit the desired tool'to be used without departing from my invention.For instance, in Fig. 5 I have shown an end view of a holder providedwith four jaws 19, each having a right-angled notch 19 formed in itsinner corner in order to receive a group composed of a multiplicity ofchisels 17, each of which is provided with a pyramidal cutting end, thegroup thus forming what is commonly termed a surfacingtool. The fourjaws 19 will be clamped upon the group of chisels by means of aclampingshell 16' like the shell 16. In order to relieve the hand of theoperator from the jar of the tool, I provide a handle composed of aspring 20, which has secured to each of its ends a collar 21, thecollars being secured to the spring in any suitable manner, preferablyby brazing. The lower collar 21 is then secured to the shank in anydesired manner, leaving the upper collar free. For convenience inmanufacture I use a single tapered pin 22, which passes through thelower collar 21, the shank 10, and the shank 13, thus securing all theparts together. It will be understood that the lower collar 21 may beleft free and the upper collar 21 attached to the shank, if desired. Thecutting-Chisels 17 are projected from the holder just enough to enablethe operator to retain a good view of the cutting end of the chisels atall times, and as the chisels wear the abutment is adjusted downwardalong the threads 13', so that the greater portion of the chisels may beused.

I claim as my invention 1. A tool-holder consisting of a main bodycarrying in its lower end a pair of jaws between which a tool may beinserted, a clamping-shell threaded on said jaws, and an abutment alsothreaded upon said jaws within said shell and arranged to engage theinner end ol the tool mounted between the jaws.

2. A tool-holder consistingof a main body carrying in its lower end apair of jaws between which a tool may be inserted, a clamping-shellthreaded on said jaws, an abutment also threaded upon said jaws andarranged to engage the inner end of the tool mounted between the jawswithin said shell, and ahandle consisting of a spring member attached atone end only to said holder and of less length than the body of the toolwhereby a portion projects through the handle.

3. A tool-holder consisting of a main body carrying in its lower end apair of jaws between which a tool may be inserted, a clamping-shellthreaded on said jaws, an abutment also threaded upon said jaws andarranged to engage the inner end of the tool mounted between the jaws,and a handle consisting of a spiral spring inclosing the holder-body andprovided at one end with means for attachment to said body, said spiralspring being of less length than the holder-body whereby itsforce-receiving end will project through.

In Witness whereof I have hereunto set my hand and seal, atIndianapolis, Indiana, this 26th day of September, A. D. 1904:.

STEPHEN W. GOODHUE. [11. s]

Witnesses:

ARTHUR M. Hoop, JAMES A. WnLsH.

